No Video or Screen sharing in iChat since last update.

I recently purchased a new MacBook Pro 15.4" laptop.
When I first started up, iChat worked beautifully. But after I installed the series of updates, I chat will not send or receive video, and will not allow screen sharing. It's telling me that there's no response from whoever I am trying to connect with. I've tried with three other Mac users, and no luck.
Has anyone else had this problem? Is there a fix for this?

Did you install http://www.apple.com/downloads/macosx/apple/application_updates/compatibilityupd ateforquicktime.html

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